Analeptically active n-substituted aminonorcamphane derivatives and their acid addition salts and quaternary ammonium compounds



United States Patent 3 164,601 ANALEPTICALLY I. ACTIVE N SUBSTITUTED AMINONORCAMPHANE DERIVATIVES AND THEIR- ACID ADDITION SALTS AND QUA- 11 claims. oi. 260-2945) The present invention relates to novel aminobicyclo- (2,2,1) heptanes of the formula wherein: R is phenyl, naphthyl, phenylalkyl containing 7-8 carbon atoms, cyclohexyl, 5 or 6 membered sulfur or ni-' trogen containing heterocyclic radical of phenyl monoor poly-substituted by alkyl containing 13' carbon atoms, alkoxy containing 1-3 carbon atoms, or halogen,

R is H, or alkyl containing 1-2 carbonatom's, N

R is alkenyl or alkynyl each containing 2-5 carbon atoms,

substituted alkyl containing 2-5 carbon atoms, subyl, 3-chlorophenyl, 4-bromophenyl, 4-hydroxyphenyl, 3,4- dihydroxyphenyl, 3,4-dimethoxyphenyl, 4-ethoxyphenyl, p-tolyLp-cumyl, maxylyl and the like.

'Radical R for example, can be alkenyl or alkynyl groups containing 2-5 carbon atoms, such as vinyl, allyl, crotyl, pentenyl, ethynyl, butynyl, or alkyl groups containing 2-5 carbon atoms substituted by OH, halogen, alkoxy or alkylthio groups containing 1-3 carbon atoms or NH; orsubstituted NH; groups such as 2-hydroxy ethyl, S-hydroxy butyl, 3,5-dihydroxy pentyl, bromo ethyl, 4-chlorobutyl, ethoxy pentyl, propoxy pentyl, methyl thiobutyl, ethyl thioethyl, amino ethyl, S-amino pentyl, dimethyl amino butyl, diethyl amino propyl, pyrrolidino ethyl, 4-piperidino butyl and the like, and in addition the correspondingly substituted cyclopentyl, cyclohexyl, benzyl or phenylethyl radicals, such as 2-ethyl cyclopentyl, p-hydroxy cyclohexyl, p-methoxy benzyl, 2,4-dichlorophenyl V ethyl and the like.

Radicals R and R also can form a 5 or 6 membered saturated ring with the nitrogen atom which also may contain further heteroatoms, such as nitrogen or oxygen,

" and be monoor poly-substituted, such as the substituted stituted cyclo alkyl containing 5-6 carbonatoms, substituted aralkyl containing 7-8 carbon atoms, the substituted alkyl, cycloalkyl or aralkyltcarrying ,one .or more substituents selected from the group consisting of OH, halogen, alkoxy containing 1-3 carbon atoms, alkylthio containing 1-3 carbon atoms, NH, or substituted NH wherein one or both of the hydrogen atoms may be replaced with alkyl containing l-3 carbon atoms or wherein the nitrogen atom is a constituent The novel compounds according to the invention have a strong analeptic action and are excellently tolerated.

These novel compounds can be prepared by converting a compound of the formula wherein R and R have the same significance as above into the corresponding N monoor disubstituted compound of Formula H above by known alkylation methods and, if desired, transforming such compounds into their quaternary ammonium derivatives or pharmacologically acceptable acid addition salts.

Radical R for example, can be phenyl, naphthyl, cyclohexyl or phenyl alkyl containing 7-8 carbon atoms or a sulfur or nitrogen containing 5 or 6 membered heterocyclic ring, such as pyridyl, piperidyl, thienyl or thiazolyl radicals. When R is phenyl it can also be substituted additionally with one or more alkyl or alkoxy radicals containing 1-3 carbon atoms, OH groups or halogen atoms, such as, for example, 2-fluorophenyl, 3 -fluorophenpyrrolidino, pyrazolidino, piperidino, piperazino or morpholino radicals containing =0, OH, halogen, such as chlorine and bromine, and/or one or more allyl groups ..be treated-with w-halo carboxylic acid halides, treating the thus obtained w-hailo substituted carboxylic acid amides with amines or substituted amines to form the w-amino substituted carboxylic acid amides and reducing these, for example, with lithium aluminum hydride to the corresponding w-amino alkyl amines.

In the production of compounds wherein R and R are joined to produce an alkyl substituted heterocyclic ring, a primary amine of Formula I can be reacted with a corresponding a-w-dihalogenated butane or pentane, such as 1,4-dibromo-2-ethyl-butane, 1,4-dichloro-2-propyl-butane, 1,5-dibromo-2-methyl pentane, 1,5-dibromo- 2,3-dimethyl pentane, 1,5-diiodo-3-ethyl pentane and the like.

Compounds containing a5 or 6 membered heterocyclic ring substituted by =0 in the B or 7 position, for example, can be produced by reacting an amine of Formula I with an ester of an cap-unsaturated carboxylic acid or a halogen substituted carboxylic acid, condensation of the thus obtained bis-(carboxy alkyl)-amino compound according to Dieckmann, for example, with the aid of sodium in xylene, and subsequent saponification and decarboxylation of the 3-(or 4-)earboxy alkyl-4-(or tion on the heterocyclic ring, for example, can be proample, the oxo group can be easily reduced to'the hy-- 'droxy group and the hydroxy group can, if desired, be

converted to a halogen by treatment with concentrated hydrohalic acids.

A number of the compounds according to the'invention which have been produced are given in the following table:

The primary amines used as starting materials can be produced in a known manner, for example, according to the processes described in]. Amer. Chem. Soc., vol.

61 (1939), page 521, vol. 73 (1951), page 5068, and

J. Org. Chem., Vol. 8 (1943), page 373, by diene addition of w-n-itrostyrene or the nuclearly substituted and/ or '[iqnethylated nitrostyrene derivatives on cyclopentadiene or dicyclopentadiene and subsequent hydrogenation which I- can be carried out in one step or stepwise.

The compounds according to the invention are very good analeptics. They were tested against the well known active phenmetrazine in a CNS (central nervous system) screening test according to Irvin (Arch. Int. Pharmacodyn., vol. 118, page 358, 1959). Such tests showed, for example, that 2-pl1enyl-3fiahydroxyethylamino-bicycloydrochlorid bT1105 (0.3 mm.

b=127 (0.2 mm.

m.p. of nitrate= CH3 m.p. of Reineckate= 18 4 05m H.-. CHzCHiOHzNI on; c=2 32 C 11 H CHz-CH CH2(C2H5)N CH9 miggfpicrate= R a=m.p. i b=b.p.

R1 R; N R c=m.p. of

\ hydro- 4 chloride c n. H N: =o c=208 C0115 H a=116f OH can, E... If c=198 0 11; H N b=128(1mn1.

Upon treatment of compounds of Formula II according to the invention their acid addition salts are obtained. As

such acids those which yield pharmacologically acceptable salts can be used. ForeXample, the following salts can be prepared: the chlorides, orthophosphates, nitrates, sulfates, maleates, fumar'ates, citrates, tartrates, oXalates, methane sulfates, sodium disulfonates, hemisuccinates, propionates, butyrates, ascorbates and acetates. l

The quaternary ammonium derivatives can be obtained by reacting compounds of the Formula II with all -com pounds suited for quaternization, such'as, for example, alk y1 or aralkyl halides or'dialkyl sulfates.

(2,2,1)-heptane and 2-phenyl-3-N-ethyl-N-allylaminobicyclo-(2,2,1)-l1eptane have three times the stimulating action. Analogous results were'obtain ed with tests using a vibration cage (J. Aschoif, P-fiigers Arch. ges. Physiol. 254, 262, 1951) and 'with'tests using a squirrel cage cylinder (S. Sommer and R. Hotovy, Arzneimittel- Forschung 11, 1961). About the sarne superiority in stimulating activity of the compounds according to the invention was found when they were compared with the most similar previously known compound, namely, Z-phenyl-3 dimethylaminobicyclo (2,2,1) heptane. In

' 75 addition, for example, the 2-phenyl 3y-hydroxypiperidinm pressure and furthermore, just as the 2-phenyl-3-N-ethyl' N-allylaminobicyclo-(2,2,l)-heptane, exhibits very excellent compatibility. The acute toxicity, for example, is only one-half of that of 2-phenyl-3-dimethylaminobicyclo- (2,2,l)-heptane.

In therapeutic application the compounds according to the invention can be'administered in dosage units of 20 or 30 mg.. in the form of tablets. In general,.the daily dosage is 2-3 tablets and preferably administered in the morning and/ or at noon. Indicationsfor example, are hypotension, states of exhaustion, convalescence and all states involving loss of efficiency and lack of drive.

Thefollowing examples will serve to illustrate a number of the compounds according to the invention and their preparation.

Example 1 ous sodium hydroxide and extracted with ethei f'The ether extract after drying with sodium sulfate was distilled off and the residue distilled under vacuum. The yield of 2-phenyl-3-N-ethyl-N-allyl-arnino-bicyclo-[2,2,1]- heptane was 20.8 g. having a boiling point of 127 C. at 0.2 mm. Hg. Its picrate has a melting point of 155 C. after recrystallization from ethyl acetate. TAnalogously, 3-N-ethyl-N-allyl-amino-bicyclo-[2,2,1]- hep tanes carrying the following substituents in 2 position were obtained by reacting allyl brornide with the correspondingly substituted bicyclo-[ 2,2,l]-heptai1 es:

(a) p-Cuminyl. (b) Fluorophenyl A (c) (3',4'-dihydroxy)-.phcnyl' (d) p-Metlioxyphenyl zyl (f) Cyclohe xyl (g). Thiophenyl 2' (h) Piperidyl 2' Example 2 p 18.7 g. of 2-phenyl-3-amino-bicyclo-[2,2,11-heptane were heated together with 4.4 g. of ethylene oxide in 20 cc. of benzene with the addition of 2 cc. of water in a bomb tube for hours at 100 C. The reaction solution after cooling was washed with water, dried withso dium sulfate and the'benzene distilled .ofi. The residue was fractionated under vacuum. The Z-phenyl-Ii-fi-hydroxyethyl-amino-bicyclo-[2,2,11-heptane obtained had a boiling point of 174 .C. Its hydrochloride melted at 133" C. after recrystallization from isopropanol-ether.

Example 3 -ethyl)-amino-bicyclo [2,2,1]-heptane hydrochloride was 6 Analogously, 3 bis-(,B-hydroxyethyl)-amino-bicycld [2,2,1]-heptanes carrying the following substituents in the 2 position were obtained by reacting the correspondingly substituted bicyclo-[2,2,1]-heptanes with ethylene oxide:

( y y (b) p-Fluorcphenyl (c) o-Chlorophenyl (d) p-Ethoxy phenyl (e) 3 ,4'-dihydr oxy) -phenyl (f) Phenylethyl Example 4 10.75 g. of 2-phenyl 3-ethyl-amino-bicyclo-[2,2,1]- heptane were heated with 4.72 g. of trimethylenechlorhydrin for 8 hours in a bomb tube at C. The reaction product was dissolved in water, alkalized with NaOH and extracted with ether. The ether was distilled off from the extract, leaving 7.5 g. of 2-phenyl-3-N-ethyl-N- 'y-hydroxypropyl-amino-bicyclo-[2,2,11-heptane boiling at -170 C. at 0.05 mm. Hg. The hydrochloride melted at 152 C. after recrystallization from isopropanol.

Example 6 52 g. of B-bromopropionyl chloride were dropped into 112.2 g. of 2-phenyl-3-arnino-bicyclo-[2,2,1]-heptane in 700 cc. of benzene While stirring and cooling to maintain a temperature of about +30 C, and the mixture then boiled under reflux for 10 minutes. The reaction mixture was washed with water, dilute NaOH and again with water; After drying over sodium sulfate the henzene was distilled off. .96 g. of crude 2-phenyl-3-fi-bromopropionyl-amino-bicyclo- 2,2, l -heptane remained as a tough oil. After recrystallization from ethyl acetate petroleum ether it had a melting point of 118-120? C.

43 g. of such crude product in 70 cc. of benzene were heated with 144 g. of a 10% solution of dimethylamine in benzene for 6 hours at 120 C, in an autoclave. The

benzene solution was shaken out with 5% HCl and the lithium aluminum hydride in 70 cc. absolute tetrahydro furane' while stirring and the mixture then refluxed for 8 hours. After cooling, 3.4 cc. of water, 3.4 cc. of 15% NaOH and then 10 cc. of water were added. The mixture was then filtered and the tetrahydrofurane distilled off from the filtrate. The residue was taken up in ether and the resulting solutionshaken out three times with 5% HCl. The acid extract was alkalized with NaOH and extracted with ether and the ether distilled off from the ether extract. Crude 2-phenyl-3-'y-dimethylaminoproPyI amino-bicycIo-[2,2,1]-heptane remained as a residue which was converted to its hydrochloride in alcoholic solution with hydrochloric acid in ether.

After'recrystal- 7 lization from alcohol-ether the hydrochloride melted at 222 C.

Example 7 tracted with ether and converted to its dihydrochloride with HCl in ether.

The melting point of the dihydrochloride was 232C.

7 Example 8 38 g. of 2-phenyl-3-amino-bicyclo-[2,2,1]-heptane were heated with 80 g. acrylic acid ethyl ester in 40 cc. of.

absolute alcohol for 14 hours at 150 C. in an autoclave. Substantially the same results were obtained by refluxing the mixture for 100' hours. The alcohol Was distilled off under vacuum and the residue fractionated under vacuum. 51 g. of 2-phenyl-3-bis-(fi-carbethoxyethyl)- amino-bicyclo-[2,2,1]-heptane of a boiling point of 205 C. at 0.05 mm. Hg were obtained. Its hydrochloride melts at 158 C.

The same compound was obtained by reacting 2- phenyl-3-amino-bicyclo-[2,2,1]-heptane with fl-halopropionic acid ethyl ester in the presence of basic condensing agents, 'such as sodium bicarbonate, sodium alcoholates, tertiary amines and the like.

7.4 g, of such compound in cc. of absolute xylene weredropped into 15 cc. of absolute xylene containing 0.6 g. of powdered sodium at 80 C. The mixture was stirred for 3 hours at 60 C. and then 30 cc. of water were added to the reaction mixture. The xylene solution was separated off, dried and the xylene distilled off. Crystallized 2 phenyl-3-li-carbethoxy-'y-oxopiperidino-bicyclo-[2,2,l]-heptane-HC1 was obtained from the residue by treatment with HCl in ether. Its melting point after recrystallization from isopropanol was 198 C.

1.7 g. of such product were boiled under reflux with 10 cc. of concentrated HCl for 10 hours. The hydro chloride slowly went into: solution. The HCl was distilled off under vacuum and the residue recrystallized from acetone. 1.2 g. of 2-phenyl-3w-oxopiperidinobicyclo-[2,2,1]-heptane of a melting point of 208 C. were obtained.

Example 9 3.2 g. of Z-phenyl-3-'y-oxopiperidino-bicyclo [2,2,1]- heptane hydrochloride were shaken in 50 cc. of water with 1 g. of Raney nickel under hydrogen at a gauge pressure of 100 atmospheres and a temperature of 80 C. The calculatedquantity of hydrogen was taken up rapidly. This catalyst was filtered off and the filtrate evaporated to dryness under vacuum. The residue was recrystallized from isopropanol-ether. After a further recrystallization from water, the melting point of the Z-phenyI-S-y-hydroxypiperidino-bicyclo-[2,2,1J-heptane was 198 C. J

' 3 grams of such product were heated with 25 cc. of concentrated HCl for 2 hours at 100 C. in a bomb tube. The resulting 2 phenyl 3 'y-chloropiperidino bicyclo- [2,2,1]-heptane HClwas recovered from the reaction mixture in the usual manner.

Example 10 10.5 g. of a-bromovaleric acid ethyl ester were refluxed with 18.7 g. of 2-phenyl-3-amino-bicyclo-[2,2,1]-heptane in 30 cc. of toluene for 22 hours. The reaction solution was diluted with cc. of toluene and Washed with water. After drying with sodium sulfate, the toluene was distilled off under vacuum, the residue dissolved in ethyl acetate and acidified withHCl in ether. 7.9 g. of 2-pheny1-3-6- 8 carbethoxybutyl-amino-bicyclo-[2,2,1]-heptane-HCl of a melting point of 132 C. were obtained. 7

Upon saponification of such product with dilute NaOH, the free acid was obtained which crystallized out upon adjusting the pH of the saponification solution to 3.9.

4 g. of this, product, namely, 2-phenyl-3-6-carboxybutylamino-bicyclo- [2,2,11-heptane were heated for 15 minutes (until evolution of steam ceased) at 180 C. The residue crystallized uponrcooling and was recrystallized from ethyl acetate. The yield was 3.5 g. of 2-phenyl-3-a-oxo piperidino-bicyclo-[2,2,1]-heptane of a melting point of Example .11

18.7 g. of 2-phenyl-3,-amino-bicyclo- [2,2,1]-heptane and 25.3 g. of 1,4-dibrorno-2-methyl butane were refluxed with 96 g. of 10% NaOH for 10 hours. The reaction mixture was extracted with ether, the extract washed with water, dried with sodium sulfate and the ether distilled off. The residue was distilled under vacuum to obtain the pure 2-phenyl-3-(2' methyl pyrrolidino) bicyclo [2,2,1]-

heptane of a boiling point of 128 C. at 1 mm. Hg.

Analogously, 3- (2-methyl-pyrrolidino) -bicyclo- [2,2, 1] heptanes haying the following substituents inv the 2 position were obtained:

(a) p-Propoxyphenyl I (b) (3',4-dichloro)-phenyl (c)v Thiophenyl-2' Example 12 37.4 g. of 2-phenyl-3-amino-bicyclo-,[2,2,1] heptane were heated with 9.5- g. of methyl-2-ch1oroethyl ether for 14 hours at C. After cooling down the melt it was taken up in ether, washed with water and the ether distilled off. The residue was dissolved in dilute HCl and .decolorized with charcoal, filtered and alkalized with NaOH. The base which crystallized out was taken up inether, dried with sodium sulfate, filtered and the ether distilled off. The residue (22 g.) was dissolved in dilute I INO whereupon 19 g. of the nitrate of 2-phenyl-3-flmethoxyethyl-amino-bicyclo-[2,2,1] heptane crystallized out after a short time. After recrystallization from alcohol-ether its melting point was 162 C,

Analogously, when methyl-2 -chloi oethyl sulfide was used the 2 phenyl 3 Bmethylthioethyl-amino-bicyclo- [2,2,1]-heptane was obtained.

Example 13 6.16 g. of 2-.phenyl-3-/i-methoxyethyl amino bicyclo- [2,2,1]-heptane were heated with 2.2 g. of a 30% formaldehyde solution, 1.4 g. sodium formate, 1.8 g. of formic acid and 10 cc. of water on a steam bath until evolution of CO ceased. The solution was then alkalized with NaOH andzextracted with ether. The extract was washed with watendried with sodium sulfate and the ether distilled off. The residue. was dissolved in absolute alcohol and neutralized with HCl in ether. 5. g. of the hydrochloride of 2-.phenyl=3aN firmethoxy-ethyl-N-methyl amino bicyclo- [-2,2,.1 ];-heptane. of a melting point of 182 C. were obtained.

Example 1 4 20 g. of 2- phenyl-3-N-ethyl amino bicyclo-[2,2,1]-heptane-HCl were boiled under reflux with 20 g. sodium bicarbonate, 11.6 g. propargyl bromideand cc. of absolute alcohol for .24 hours while stirring. The excess sodiumbicarbonatewas filtered off and the alcohol distilledofli under. vacuum. The residue was taken up in 9 Example 15 Analogonsly to Example 1, the following compounds were obtained by reacting the corresponding alkenyl halides and amino-bicyclo-[2,2,IJ-heptane derivatives:

(a) 2-phenyl-3-N-ethyl-N-vinyl-aminobicyclo [2,2,1]-

heptane (b) 2-p-fluorophenyl-3-N-ethyl-N-butadienyl-amino-bicyclo [2,2, 1]-heptane (c) 2-phenyl-3-N-ethyl-N-pentenyl-(3')-amino bicyclo- [2,2,1]-heptane (d) 2-( 3,4-dimethoxypheny1)-3-N-ethyl-N-allyl aminobicyclo- 2,2, 1 -heptane.

We claim: 1. A compound selected from the group consisting of: (1) a compound of the formula Y (3H2 R: [IIRI wherein in which:

R is selected from the group consisting of vinyl,

allyl, crotyl, propargyl, pentenyl, ethynyl, butynyl, butadienyl, 2-hydroxy ethyl, 3-hydroxy propyl, 3-hydroxy butyl, 3,5-dihydroxy pentyl, bromo ethyl, chloro ethyl, 4-chlorobutyl,met11- oxy ethyl, ethoxy pentyl, propoxy pentyl, meth yl thioethyl, methyl thiobutyl, ethyl thioethyl, amino ethyl, S-aminopentyl, dimethylamino ethyl, dimethylamino propyl, dimethylamino butyl, diethylamino propyl, pyrrolidino ethyl, 3-pi- 10 piperidino propyl, 4-piperidino butyl, Z-ethyl cyclopentyl, p-hydroxy cyclohexyl, p-methoxy benzyl, and 2,4-dichlorophenyl ethyl, and R is selected from the group consisting of hydrogen, alkyl of 1-3 carbon atoms and R (2) the non-toxic pharmaceutically acceptable acid addition salts thereof; and (3) the quaternary ammonium salts thereof obtained by reacting the free base with a member selected from the group consisting of alkyl halides, aralkylhalides and dialkyl sulfates. 2. 2 phenyl 3 N ethyl N allyl amino bicyclo- [2,2,1]-hcptane. g

3. 2 phenyl 3 p hydroxy ethyl -amino bicyclo- [2,2,1]-heptane. 1 4. 2 phenyl 3 bis (,3 hydroxyethyl) aminobicyclo- [2,2,1 -heptane.

5. 2 phenyl 3 'y hydroxypiperidino bicyclo- [2,2, 1]-heptane.

6. 2 phenyl 3 allylamino bicyclo-(2,2,1)-heptane. 7. 2 phenyl 3 N ethyl N ([3 hydroxyethyD- amino-bicyclo- 2, 2, 1 -heptane.

8. 2 phenyl 3 ('y hydroxypropylamino) bicycl0- (2,2,1 )-heptane.

9. 2 phenyl 3 N ethyl N (y hydroxypropyD- amino-bicyclo- (2, 2, 1 -heptane.

10. 2 phenyl 3 bis (,3 chloroethyl) aminobicyclo- (2, 2,1 -heptane.

11. 2 phenyl 3 N ethyl N propargyl aminobicyclo- (2, 2, 1 -heptane.

References Cited in the file of this patent UNITED STATES PATENTS 2,904,591 Hancll et a1 Sept. 15, 1959 2,955,073 De Beer Oct. 4, 1960 2,986,573 Topliss et a1 May 30, 1961 3,014,037 Rorig Dec. 19, 1961 3,074,961 Poos Jan. 22, 1963 FOREIGN PATENTS 223,025 Australia July 29, 1959 1,110,159 Germany July 6, 1961 OTHER REFERENCES Parham et al.: Journal of the American Chemical Society, vol. 73: pp. 5068-5070 (1951).

IRVING MARCUS, Primary Examiner.

NICHOLAS S. RIZZO, WALTER A. MODANCE,

Examiners. 

1. A COMPOUND SELECTED FROM THE GROUP CONSISTING OF: (1) A COMPOUND OF THE FORMULA 